Importance of controllable Al sites in CHA framework by crystallization pathways for NH3-SCR reaction

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 大气污染控制中心

	Importance of controllable Al sites in CHA framework by crystallization pathways for NH3-SCR reaction
	Zhang, Juan; Shan, Yulong; Zhang, Ling; Du, Jinpeng; He, Hong; Han, Shichao; Lei, Chi; Wang, Sen; Fan, Weibin; Feng, Zhaochi
刊名	APPLIED CATALYSIS B-ENVIRONMENTAL
	2020-11-15
卷号	277 页码:1-9
关键词	NH3-SCR reaction CHA zeolites Al sites Organic templates Crystallization pathways
ISSN号	0926-3373
英文摘要	As a commerical catalyst of high silica CHA zeolite for NH3-SCR reaction, controllable Al sites in CHA framework for improving catalytic performance are rarely reported. In this work, two organic templates (TMAda(+) and DMCHA(+)) were employed to prepare aluminosilicate CHA zeolite with similar Si/Al ratios, donated as CHA-T and CHA-D. Detailed characterizations demonstrate that two completely distinguishable crystallization pathways can be identified as the preferential formation of smaller D6R units for CHA-D with DMCHA(+) and larger 8MRs for CHA-T with TMAda(+), resulting in spatially closer Al sites in CHA-D than CHA-T. As an interpretation, CHA-D with more paired Al atoms in 6MR generating more hydrothermally stable Cu2+-2Z sites contributes to higher activity than CHA-T at 400-550 degrees C. These results suggest that the crystallization pathways directed by rational choice of organic templates might be responsible for the controllable Al sites in the framework, which is important for designing efficient NH3-SCR catalysts.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/45083]
专题	生态环境研究中心_大气污染控制中心
推荐引用方式 GB/T 7714	Zhang, Juan,Shan, Yulong,Zhang, Ling,et al. Importance of controllable Al sites in CHA framework by crystallization pathways for NH3-SCR reaction[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2020,277:1-9.
APA	Zhang, Juan.,Shan, Yulong.,Zhang, Ling.,Du, Jinpeng.,He, Hong.,...&Xiao, Feng-Shou.(2020).Importance of controllable Al sites in CHA framework by crystallization pathways for NH3-SCR reaction.APPLIED CATALYSIS B-ENVIRONMENTAL,277,1-9.
MLA	Zhang, Juan,et al."Importance of controllable Al sites in CHA framework by crystallization pathways for NH3-SCR reaction".APPLIED CATALYSIS B-ENVIRONMENTAL 277(2020):1-9.